package com.itheima.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否登录
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter" ,urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    //路径匹配器,支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //输出查看拦截到的请求
        log.info("拦截到请求: {}", request.getRequestURL());


//        1.获取本次请求的URL
        String requestURL = request.getRequestURI();

        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/backend/page/demo/upload.html",
                "/user/sendMsg",//移动端发送短信
                "/user/login",//移动端登录
        };
//判断传入请求是否是可放行请求
        boolean check = check(urls, requestURL);
        //如果是可放行请求那么就放行
        if (check){
        filterChain.doFilter(request, response);
        return;
        }

        //如果已经登录那么就放行
        if (request.getSession().getAttribute("employee") != null){
            //显示用户id
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));

            //获取session里到使用者id,设置到BaseContext工具类中,以便动态获取使用者ID,而进行公共字段自动填充
            Long empId =(Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            //放行
            filterChain.doFilter(request,response);
return;
        }

//4-2、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     *
     * @param urls
     * @param requestURL
     * @return
     */
    public boolean check(String[] urls, String requestURL) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURL);
            if (match) {
                return true;
            }
        }

        return false;
    }
}
